MicrostructureandPropertiesofPlasmaSprayedNanostructuredThermal BarrierCoatingsBeforeandAfterLaserGlazing
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    Abstract:

    ThenanostructuredzirconiaTBCsweremanufacturedbyatmosphericplasmasprayingwith thenanostructuredzirconiaagglomeratedpowders,andtheCO2laserbeamwiththecontinuouswavewasappliedtothelaserglazingofnanostructuredTBCs. Themicrostructures,microhardnessandthermalshockresistanceofnanostructuredTBCsandas-glazedTBCsweresystematicallyinvestigatedcomparedwithconventionalTBCs.TheresultsshowthatthenanostructuredTBCsexhibitauniquecomplexmicrostructureconsistingofcolumnargrainsandnon-meltedorpartiallymeltednanosizedparticles,whilethemicrostructureof theas-glazedcoatingsisacombinationofthecolumnargrainsinthefractureandtheequiaxedgrainsonthe surface.Theexpeirimentalresultsofthemicrohardnessandthermalshockresistancepresentthatthenanostructuredcoatingsandtheas-glazedcoatingspossessbetterpropertiesthantheconventionalcoatings.Sothe hybridprocesswherethenanometertechnologyandlaserglazingarecombinedwithatmosphericplasma sprayingtoprepareTBCsisrevealingahighpotentialfortheimprovementofTBCsproperties.

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  • Received:
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  • Online: November 28,2016
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